Re(Yo)
Im(Yo)
Susceptance
forward
TRIP
TRIP
Conductance
forward
TRIP
Susceptance
reverse
TRIP
Conductance
tilt
Ang
>0
Susceptance
tilt
Ang
<0
Conductancereverse
GUID-5BF18732-8375-40EE-B64A-73D44D04B906 V1 EN
Figure 187:
Combined non-directional overconductance and non-directional
oversusceptance characteristic
The non-directional overconductance and non-directional
oversusceptance characteristic provides a good sensitivity and selectivity
when the characteristic is set to cover the total admittance of the protected
feeder with a proper margin.
The sign of the admittance characteristic settings should be considered
based on the location of characteristic boundary in the admittance plane.
All forward-settings are given with positive sign and reverse-settings with
negative sign.
4.2.4.6
Application
Admittance-based ground-fault protection provides a selective ground-fault protection
for high-resistance grounded, ungrounded and compensated networks. It can be applied
for the protection of overhead lines as well as with underground cables. It can be used as
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
393
Technical Manual
Содержание Relion 615 series
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